Abstract
As a high temperature protective layer, platinum-iridium alloys were electroplated on the nickel-base single crystal superalloy TMS-82+ from amidosulfuric acid solutions by the direct current method. It was found that Ir content in the films was always lower than the ratio of concentration ([Ir 3+]/([PtCl62-] + [Ir3+])) in the electrolytes, indicating that preferential deposition of Pt occurred in this study. The asdeposited Pt-Ir films formed an fee single phase structure with a granular surface. When Ir content exceeded 3 at%, Pt-Ir films exhibited the 〈111〉 preferred growth orientation. It was also found that pre-deposition of Ni and Pt promoted the deposition rate and changed composition of overlaying Pt-Ir films.
Original language | English |
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Pages (from-to) | 2176-2179 |
Number of pages | 4 |
Journal | Materials Transactions |
Volume | 46 |
Issue number | 10 |
DOIs | |
Publication status | Published - 2005 Oct |
Externally published | Yes |
Keywords
- Direct current method
- Electroplating
- Ni-base superalloy
- Platinum-iridium films
- Pre-deposition
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering